Im thinking about the PT-40
Righty,
You will get all kinds of "advice" on which trainer is better and why but the "truth" is when comparing performance one trainer is as good as another so it makes the "which trainer should I get question" moot.
The secret to a successful introduction to this hobby is picking a GOOD Instructor.
Go find the instructor and see what he/she reccomends if you like or go out buy a trainer package and go to the field.